Controlling mechanism for elevator-hoisting motors.



No. 693,908. Patented Feb. 25, I902.

H. ROWNTREE.

CONTROLLING MECHANISM FOR ELEVATOB'HOISTING MOTORS.

(Applicatiop filed Sept. 9, 1901.) I

( No Model.)

ilm riu STATES PATENT OFFICE.

HAROLD ROWNTREE, OF CHICAGO, ILLINOIS, ASSIGNOR TO BURDETT- ROWNTREEMANUFACTURING COMPANY, OF CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

CONTROLLING MECHANISM FOR ELEVATOR-HOISTING MOTORS.

SPECIFICATION forming part of Letters Patent N 0. 693,908, datedFebruary 25, 1902.

Original application filed May 20, 1901, SerialNo. 61,018. Divided andthis application filed September 9, 1901. Serial No. 74,733. (No model.)

To aZZ whom it may concern.-

Be it known that I, HAROLD ROWNTREE, a citizen of the United States,residingat Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Controlling Mechanism for Elevator- HoistingM0- tors, of which the following is a specification.

This invention relates to controlling mechanism for elevator-hoistingmotors.

The object of the invention is to provide a construction and arrangementof controlling mechanism for elevator-hoisting motors whereby themanipulation of the controllercable may be readily and easily effected.

A further object of the invention is to provide a controlling mechanismwhich maybe actuated automatically to arrest the travel of the car atthe limits of travel thereof.

Other objects of the invention will appear more fully hereinafter.

The invention embraces subject-matter divided from my application,Serial No. 61,018, filed May 20,1901; and itconsists substantially inthe construction, combination, location, and arrangement of parts, allas will be more fully hereinafter set forth, as shown in theaccompanying drawings, and finally pointed out in the appended claims.

The single view on the accompanying drawing is an elevation of anelevator and hoisting and control mechanism therefor, showing theapplication thereto of a motor-controllin g mechanism embodying theprinciples of my invention.

Referring to the accompanying drawing, reference-sign A designates thecar or cage, 13 the hoisting-motor, and C the hoisting-ca ble. Theseparts may be of the usual or any well-known type or construction. In theparticular form shown, to which, however, the invention is not limited,the motor B is an electric motor and operates a hoisting-drum D, overwhich the hoisting-cable C operates, said cable operating over suitableguidesheaves and being connected to the car in the usual manner.

The hoisting-motor controller is indicated generally by reference-signvS and may be of any suitable or convenient construction, de-

pendent upon the character of the motor. For instance, when an electricmotor is employed the motor-controller S will be in the form of anelectric switch having suitable connections'with thecontroller-operating mech-- anism, whereby said switch may be actuatedin the required manner. In the particular form ofmotor-controller-operating mechanism shown I employ a hand-cable of thetype known in the art as a running cable-that is, a cable suitablyconnected to move or travel With the car. In the drawings referencesignQ designates the controller or hand cable. This cable operates over apulley 8 at the top of the elevator shaft or well, the operating leg orrun thereof extending from said pulley through the elevator shaft orwell to and around a pulley 9, mounted upon a fixed bracket arranged atthe bottom of the elevator shaft or well, thence around pulley 12,carried upon a lever R, mounted to rock upon a fixedsupport,thencearoundapulleyorsheave 13, mounted upon the shaft of drum Dor connected to said drum to revolve therewith, and

thence around a pulley 12, carried by the opposite end of rocking leverR, said lever being pivotally mounted intermediate pulleys 12. Thencethe hand or operating cable passes around a pulley 10 upon the fixedbracket, andt-hence to pulley 8 at the top of theelevator shaft or well.From this construction and arrangement it will be seen that theoperating-cable Q travels in the same direction as the car. Thecontroller S is suitably connected to the rocking lever R-as, forinstance, by means of a link or arm T. Therefore by rocking lever R thecontroller is actuated in one direction or the other accordin g to thedirection in which leverR is rocked.

In controller-operating mechanism and especially of the running-cabletype a considerable pull is required in order to effect an actuation ofthe control-cable to operate the controller, and if the control-cabletravels at the same rate of speed as the car the cable slips through thehands or grip of the operator, especially if the car has attained anyconsiderable speed of travel, which is liable to in.- jure the hands ofthe operator and to result in a failure to effect the desired actuationof the controller, particularly in stopping. It is the special purposeof this invention to avoid this difficulty, and in order to accomplishthis result I provide means whereby the control-cable is caused totravel at a slower speed than the speed of travel of the car, but stillin the same direction, and to this end I employ a pulley or sheave 13,over which said control-cable operates, of smaller diameter than thediameter of the hoisting-drum. By this arrangement the speed of travelof the car exceeds the speed of travel of the control-cable, therebyenabling the operator or elevatorconductor to manipulate thecontrol-cable more readily and easily to effect the actuation of themechanism which controls the speed of travel of the car and reduces thedanger of injury or failure to operate the controller by reason of ahigh rate of speed of travel of said cable.

In order that the control-cable may be automatically actuated at theextreme limits of travel of the car in order to operate the controllingmechanism, I provide the control-cable with suitable stop devices 14 15,in position to be engaged automatically by the car as it approaches theextreme limits of its travel. Since the car travels at a greater rate ofspeed than the control-cable, it will be seen that the car overtakesstops 1a or 15, as the case may be, as it approaches the limits of itstravel, thereby effecting an automatic actuation of the control-cableand of the controlling mechanism to arrest the hoisting-motor as the carapproaches the limits of its travel in either direction.

Having now set forth the object and nature of myinvention and aconstruction embodying the principles thereof, I desire it to beunderstood that many variations and changes in the details ofconstruction and arrangement would readily suggest themselves to personsskilled in the art and still fall within the spirit and scope of myinvention; but,

What I claim as new and useful and of my own invention, and desire tosecure by Letters Patent of the United States, is

1. In an elevator, a car, a hoisting-motor therefor, and means forcontrolling said motor including a cable, and means for moving saidcable at a slower speed than the speed of travel of the car, as and forthe purpose set forth.

2. In an elevator, a car, a hoisting-motor, a motor-controlling cable,and means for driving said cable in the same direction with but at aslower speed than the car, as and for the purpose set forth.

3. In an elevator, a car, a hoisting-motor therefor, connections betweensaid motor and car, a control-cable arranged to travel in the samedirection as the car but at a different speed, and means controllable bysaid cable for varying the speed of travel of the car, as and for thepurpose set forth.

4. In an elevator, a car, a hoisting-motor therefor, a runningcontrol-cable, motor-controlling mechanism for controlling the directionand speed of the car, connections between said running control-cable andsaid motor controlling mechanism, and means whereby the control-cableruns at a different speed from but in the same direction as the car, asand for the purpose set forth.

5. In an elevator, a car, a hoisting-drum, means for actuating the same,a sheave or pulley mounted on the shaft of said drum but of smallerdiameter than said drum, a control-cable operating over said sheave orpulley, motor-controlling devices, and connections between saidcontrol-cable and said controlling devices, as and for the purpose setforth.

6. In an elevator, a car, a hoisting-motor therefor, controllingmechanism for said motor including a controller, a rocking lever, connections between said lever and controller, sheaves carried by saidlever, a control-cable, fixed guide-sheaves therefor, said cableoperating over the pulleys on said lever, and a sheave actuated by saidmotor for driving said cable at a slower speed from but in the samedirection with the travel of the car, as and for the purpose set forth.

In witness whereof I have hereunto set my hand, this 30th day of August,1901, in the presence of the subscribing witnesses.

HAROLD ROWNTREE.

Witnesses:

CHARLES H. SEEM, E. C. SEMPLE.

